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      • KCI등재

        Liquid Metal Embrittlement of Resistance Spot Welded 1180 TRIP Steel: Effect of Electrode Force on Cracking Behavior

        Du‑Youl Choi,Ashutosh Sharma,Sang‑Ho Uhm,Jae Pil Jung 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

        Liquid metal embrittlement (LME) caused cracking of Galvanized transformation induced plasticity steels was investigatedduring resistance spot welding (RSW). Effect of electrode force (3–5 kN) for a weld time of 400, and 800 ms on crack resistanceof TRIP steel was examined in relation to LME phenomenon. The microstructural characteristics of spot weld jointsand LME cracking tendency were investigated using dye penetration tests, optical microscopy, scanning electron microscopytogether with energy dispersive X-ray spectroscopy. It was found that as the electrode force increases, the crack size decreasesdue to a fast increase in crack tip temperature which rises further with more holding time up to 800 ms in high temperaturezone. Least amount of crack size was observed at 5 kN electrode force and 400 ms of welding time. Finally, the experimentalresults have also been simulated by finite element modeling (FEM) to find suitable mechanism of crack formation, and acombination of 4 kN and 400 ms was suggested for the crack free and less thermal deformation in the spot welded TRIP steel.

      • KCI등재

        A correlation for heat of vaporization of pure compounds

        Dušan K. Grozdanic,Jovan D. Jovanovic 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6

        Twenty-seven selected equations were tested on 162 compounds with 1958 calorimetric data for their abilities to reflect the temperature influence on the heat of vaporization of pure compounds. A new equation is recommended (overall percent deviation 0.27% and percent deviation 0.59% above 0.9Tr). Twenty-seven selected equations were tested on 162 compounds with 1958 calorimetric data for their abilities to reflect the temperature influence on the heat of vaporization of pure compounds. A new equation is recommended (overall percent deviation 0.27% and percent deviation 0.59% above 0.9Tr).

      • KCI등재

        Geomarketing - Tool for Consumer Spending Estimation in the Czech Tourism & Hospitality Market

        Radim Dušek,Petr Štumpf,Viktor Vojtko 사람과세계경영학회 2019 Global Business and Finance Review Vol.24 No.1

        This paper deals with a source market size estimation tool that is based on a combination of geomarketing information and consumer spending datasets. We have decided to apply a proposed estimation method on three consumption expenditure groups that are related to the tourism and hospitality industry in the Czech Republic. The geographic and consumer spending data sets for the period 2011 - 2016 were drawn from publicly available sources. With the use of GIS software, this method allowed us to estimate and graphically display consumer spending on recreation and culture; restaurants and hotels; and transport in 2016 at the level of Czech districts, as well as the average annual growth rate during the period 2011 – 2016. This paper describes the Czech tourism and hospitality market from its size and growth point of view. It shows the trends in expenditures for hospitality and tourism services, explain the purchasing power in Czech regions and districts and predict the development for next few years. The results obtained by this low-cost method can be easily used by enterprises from the Czech Republic within domestic tourism, as well as by the foreign companies wanting to attract Czech visitors.

      • KCI등재

        독일에서의 화행론의 수용과 변용

        김두규 대한언어학회 1999 언어학 Vol.7 No.2

        Kim, Du-Gyu. 1999. Acceptance and Transformation of Speech Act Theory in Germany. Linguistics 7-2, 289-302. Speech act theory was essentially discussed by linguistic philosophers such as J. L. Austin and J. R. Searle, who were subject to the influence of L. Wittgenstein. Therefore speech act theory has been .principally the subject of the linguistic philosophers. As the speech act theory was introduced in Germany since the late 1970's, it was accepted and transformed by some linguists such as F. Hundsnurscher, G. Hindelang and W. Franke. This paper explores the transformed forms of the orthodox speech act theory, namely 'the extended speech act theory' and 'the dialogical grammar'. (Woosuk University)

      • KCI등재

        의미적 장(semantic field)' 이론에 의한 한국어와 독일어 비교 연구

        김두규 대한언어학회 2000 언어학 Vol.8 No.1

        Kim, Du-Gyu. 2000. A Comparative Study of Korean and German According to the Semantic Field Theory. Linguistics 8-1, 191-206. The purpose of this paper is to compare some words in Korean and German, based on the semantic field, in order to show the differences of two languages and their reasons. The objects of comparison in semantic field are as follows: `go', 'die', 'come', 'words of family relation', 'academic grade' and 'words of mutual designations'. For example, the semantic field go' in German is composed of three divisions, whereas the semantic field go' in Korean is composed of only one section. This paper deals with the reason of this difference.(Woosuk University)

      • KCI등재

        와동내에 조사된 열의 전도양상에 관한 연구

        윤현두,허선,김재곤,이두철,백병주 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

        The purpose if this study was to evaluate temperature change occurred in enamel, dentin and pulp due to the heat from cavity prepration with laser. We made three models had different cavity depth : cavity depth of model Awas 3.52mm, model B was 2.32mm, model C was 1.16mm. We irradiated cavity base with thermal capacity of 30J,100J,300J/㎤s during few seconds and studied the change of temperature in tooth during 10 seconds, and estimated change of thermal capacity by different irradiated site and exposure time. AT 300j/㎤s irradiation for 2 seconds, the temperature of irradiated surface was elevated fast according to irradiated thermal energy during I second, In proportion to continuous exposure time, temperature elevated slowly The surface temperature was 1370℃. After discontinue of thermal irradiation, the heat of irradiated surface was diffused in dentin and pulp and the greatest temperature was made, The greatest temperature was disappeared within 10 seconds The greatest temperature of the inner part of model brought about very severe change by different depth. Temperature in pulp was raised by the greater irradiated energy density and exposure time.

      • KCI등재

        브레히트의 새로운 해석 시론(試論) : 브레히트 언어관

        김두규 대한언어학회 1998 언어학 Vol.6 No.2

        Kim, Du-Gyu. 1998. B. Brecht's View of Language. Linguistics, 6-2, 371-385. The current interpretation of Brecht's drama 『Mr. Puntila and His Slave Matti』 was often based on the tradition of Marxism, which has led to a unilateral interpretation Brecht was a Marxist. Therefore his works, including the above-mentioned drama, must be interpreted from the standpoint of the struggle of the classes. If we are to fully understand the true meaning of his works, we must place focus on Brecht's method of language use, which has been nearly ignored. This paper purposes to trace out the delicate phrase and method of language use employed in the drama 『Mr. Puntila and His Slave Mattia』 which is frequently noticed in the use of satire, parody, and comic expression. (Woosuk University)

      • SCIESCOPUSKCI등재후보

        Self - protective Activity of Colostral IgA Globulin from Tryptic Digestion

        Kim, Woo Jung,Kang, Yoon Se,Shim, Bong Sop,Cho, Sung Hoon,Lee, Du Bong 한국생화학회 1971 BMB Reports Vol.4 No.1

        Although the amount of IgA in serum is small compared with the amount of IgG, IgA is redominant in secretory fluids such as colostrum, saliva, nasal fluid and tears. IgA from the colostrum and saliva has a higher sedimentation constant (11S) than serum IgA(7S), and 11S colostral IgA has additional antigenic determinants with specificities which are not present in serum IgA. In addition to the heavy and light chains present in the molecule of serum IgA, colostral IgA has another protein component-the transport piece or the secretory piece. Immune globulin in colostrum accounts for the immunity to certain infections acquired by newborn mammals after suckling. After hydrolysis in the gut, proteins in the form of aminoacids are thought to be absorbed, but there is -no experimental evidence for this. We have therefore studied the problems as follows. Colostrum was collected after delivery from primiparous women, and colostraI IgA was purified by gel filtration with Sephadex G-200 and DEAE-cellulose chromatography according to the method of Cebra and Robins. Antitryptic activity was measured in two ways. First, the inhibitory capacity of whole colostrum against trypsin was performed as described by Faarvang using urea-denatured bovine hemoglobin solution as substarate. Fifty microliters of a 0.2 per cent solution of crude trypsin was warmed at 25 for 20 minutes in a water bath. One hundred and fifty microliters of fresh whole colpstrum, prewarmed to 25 or 150 microliters of human serum was added to the above prewarmed enzyme solution. Two minutes later 0.5 ㎖ of 22 per cent urea-denatured bovine hemoglobin solution and 100 microliters of 0.1 M phosphate buffer, pH 8.0, were added, and the mixture was incubated for 20 minutxs at 25° The undigested protein was then precipitated by 2.5 ㎖ of 0. 3 M trichloroacetic acid. After the mixture had been centrifuged or filtered, 50 microliters of the supernatant was used for the Folin-Ciocalteu reaction. Trichloroacetic acid was added to the blank before addition of the hemoglobin solution, and the absorbance was read at 700 mmicrons with a Beckman DU-2 spectrophotometer. The second method which we followed was as described by Kueppers and Bearn. One part pf 0. 1 per cent bovine fibrinogen in 0.1 M phosphate buffer, pH 8.0, ,was mixed with ten parts of 2 per cent hot agar (80-90°in 0.1 M phosphate buffer, pH 8. 0. On mixing the fibrinogen with hot agar the mixture immediately turned cloudy and it was poured onto a glass slide which was kept in a moist chamber for one hour. A longitudinal strip of agar, 3 mm wide, was then cut out to make a trough, and near the trough two wells, 0.4 mm ;in diameter, were punched out of the agar. The trough was filled with 0.2 per cent crLde trypsin solution in 0.1 M phosphate buffer, pH 8. 0. One hundred microliters of fresh human colostrum or isolated colostral IgA or fresh human serum were introduced side by side into the wells and the slide was left overnight at 40 in a moist chamber. After washing the slide with 0.15 M NaCl to remove the digested fibrinogen peptides, it was stained with amidoblack 10B. Using hemoglobin as substrate, colostrum-unlike serum-did not show antitryptic activity. When, however, either colostrum or colostral IgA was tested using the fibrinogen-agar-gel slide technic, it showed antitryptic activity similar to that shown by serum. The discrepancy between the two results can be explained as follows. Serum antitrypsin acts. directly on the trypsin molecule, thus protecting every kind of protein molecule from tryptic digestion. Colostral IgA on the other hand has only self-protecting activity against trypsin. Thus when hemoglobin was used as substrate there was no antitrypticactivity, whereas in the fibrinogen-agar-gel slide technic antitryptic activity was evident because colostral IgA which cannot be digested by trypsin diffused through the fibrinogen-agar medium. From the theoretical point of view also, colostral antibody should not interfere with the digestion of other nutritionally important proteins in the milk and. it should have only self-protective action for absorption or for its biologic activity in the gut. The presence of antitrypsin in colostrum was thought to aid passive alimentary immunity by delaying they hydrolysis of antibody. Chamberlain and others, however, failed to show the absorption of gamma globulin intact in piglets after experimental addition of antitxypsin. It may be then that passive immunity is aided only by the antitryptic activity of specific, intrinsic colostral IgA. At the present time we do not know whether the whole intact IgA molecule or only that part which retains the antibody activity is protected from tryptic digestion. Serum IgA and. colostral IgA differ in the presence of the so-called transport piece in the calostral IgA molecule. We have demonstrated the presence of the additional protein component in the colostral IgA. by gel filtration of reduced and alkylated colostral IgA, so it seems reasonable to assume that one possible function of the transport piece is to protect the molecule or the part of the molecule which has the antibody activity from proteolytic enzymes in the gut. Direct demonstration of the antitryptic activity of the transport piece is now under progress.

      • KCI등재
      • 스마트 미디어 시대 대학신문의 발전적 모델에 대한 탐색연구

        이두원 청주대학교사회과학연구소 2020 한국사회과학연구 Vol.41 No.2

        미디어 환경 변화에 따라 대학신문들이 위기에 직면하고 있다. 스마트 미디어 시대를 맞이하여 대학신문을 포함한 각종 인쇄 매체가 독자들로부터 외면을 당하고 있다. 다매체 다채널 시대의 뉴스 이용자들은 이제 뉴스를 얻기 위해 종이 신문이 배달되는 시간을 기다리지 않는다. 휴대폰이나 태블릿 형태의 각종 스마트 미디어 기기를 통해 언제 어디서나 원하는 뉴스를 바로 접할 수 있다. 1970~80년대 대학신문은 대학사회의 정론지로서 그리고 학문적 담론의 장(場)으로서 ‘사랑받는’ 매체였다. 하지만 종이신문 형태로 발간되는 학보(學報)는 이제 디지털 융합 미디어 시대를 맞이하여 생존의 위기에 직면해 있다. 이 논의는 스마트 미디어 시대, 위기에 직면한 대학신문이 독자들의 미디어 이용 추세에 부응하여, 대학사회의 소통 매체로서 거듭나기 위한 다양한 미디어 발전전략들을 모색해보고, 이를 바탕으로 대학신문의 발전적·대안적 모델을 탐색해 보는 데 그 목적이 있다. College newspapers are facing a crisis as the media environment changes. In the age of smart media, various print media including college newspapers are being turned away from their previous readers. News media users in the multi-channel era are no longer waiting for daily newspapers. Anyone can find the news he/she wants anytime, anywhere through a variety of smart media devices in the form of mobile phones or tablets. In the 70’s and 80’s, college newspapers in South Korea had carried the journalistic criticism over social and political agenda and provided a forum for academic discourse and debate in the intellectual community. These college newspaper are now in the era of smart media and having a difficult time to get some attention from their traditional readers. Students, faculty, staffs, alumni and community readers, who have been classified as major readers of college newspapers, can access college news today on a variety of channels using their personal smart media. In general, the birth of smart media being digital, mobile, and multi-media has resulted not only in the convergence of newspapers in printing media and news broadcasting in electronic media but also in the merge of the boundaries between news makers and new users. The readers of college newspapers already have smart media in their hands while the college newspapers remain piled up on the distribution stands. In the era of smart media, the college newspapers need to think seriously about how to meet the demands and expectations of readers as smart media users. This discussion aims to set these concerns as research inquiries and explore the developmental and/or alternative models of college newspapers in the era of smart media.

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